2022-02-14 03:22:51 +01:00
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---
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title: def-env
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layout: command
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version: 0.59.0
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---
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Define a custom command, which participates in the caller environment
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## Signature
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```> def-env (def_name) (params) (block)```
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## Parameters
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- `def_name`: definition name
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- `params`: parameters
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- `block`: body of the definition
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2022-02-21 18:26:00 +01:00
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## Examples
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Set environment variable by call a custom command
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```shell
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> def-env foo [] { let-env BAR = "BAZ" }; foo; $env.BAR
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```
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